collier



(N0 Moder.) 2 Sheets-Sheet 1.

P. BQGOLLIER & J. H. DIGNARD.

' BOILER.

No. 519,241. Patented'May 1, 1894..

(Nb Model.) v 2 SheetsSheet 2. P. B. COLLIER &-J. H. DIGNARD.

BOILER.

No. 519,241. Patented May 1, 1.894

f UNITED STATES ATENT OFFICE. F

PAGE B. COLLIER AND JosEPH H.DIGNARD, OF LAKEPORT, CALIFORNIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 519,241, dated May 1, 1894.

Application filed December 21, 1893- Srial No. 494,312. (No model.)

To all whom it may concern:

Be it known that we, PAGE B. COLLIER and J osEPH H. DIGNARD, citizens of the United States, and residents of Lakeport, in the county of Lake and State of California, have invented certain new and useful Improve ments in Boilers;

and we do hereby declare the following to be a full, clear, and exact de- .scription ofthe invention, such as will enable ducin g a large fire or heat exposed surface, and

still preserving a reduced area of occupation.

With these and other objects in View, the invention consists of the construction and arrangement of the several parts which will be more fully hereinafter described and claimed.

In the drawings: Figure 1 is a perspective view of a boiler, embodying the invention with the outer casing removed, showing the boiler partly set up. Fig. 2 is a similar view of the boiler complete, without the outer casing. Fig. 3 is a transverse vertical section taken centrally through Fig. 2. i Fig. 4. is a perspective view of the boiler with the casing thereover. Fig. 5 is a detail perspective view of one of the grate sections.

Similar numerals of referenceare employed to indicate corresponding parts in the several figures. 1

Referring to the drawings, the numerals 1 and 2 designate front and back ends which are of hollow construction and form water receptacles or chambers, and have on the upper central portion thereof a steam dome 3 from the opposite ends of which are pipe sections or elbows 4 running to thetop of each of the said ends. The front end 1 has an opening 5 therein forfeeding fuel to a sectional tubular grate 6 which is formed of two or more sections of pipe in coiled form with the lower or inner ends of each section connected re spectively to the said front and back ends. The outer pipe of each of the coils of the said grate has a pipe 7 attached thereto which extends at an upward inclination closely to the front end 1, and in rear of the same and is attached by a pipe 8 to the under portion of the said steam dome 3. The ends 1 and 2 are also connected at their upper portions by longitudinally disposed tubes or fines .9 which are alternately screwed into one of the ends and swaged in the other. The swaged ends have plugs 10 screwed thereinto by small square heads .as fully shown in Fig. 2. On alternate circles between the-circles showing the square plugs will bethe tubes screwed into the end and at the opposite ends of said tubes a similar swedged plugging connection is made as will be readily understood. It will be seen that the ends 1 and 2 form water jackets and they are all truncated in formin order to reduce the upper portions of the same and on opposite sides are located inner up-flow coils 11 which have their lower ends attached to the water jackets and their upper ends connected to the steam dome 3. These up-flow coils are placed at the same angle of inclination as theadjacent edges of the ends 1 and 2 or Water jackets, and are located inward from the said edges and are brought closely in contact with the fire bed.

On the said up-flow coils 11 are placed removable exterior up-flow coils .l2which are attached at their lower ends to the water jackets and at their upper ends to horizontally disposed truncated pyramidal superheating coils 13 placed on opposite sides of the steam dome. These exterior up-flow coils aremade removable in order that the fines may be cleaned and after the partsare all thus arranged and exterior casing 14 is placed thereover it being seen by Fig. 2 that the endsor'water jackets are mounted on a base 15 having an ash-pit 16 asfully shown. The outer casing 14 is supplied with a door 17 and proper steam and water gages as well as a blow-off will be used as may be found necessary.

The construction as set forth is exception ally useful and convenient, in that a large amount of water heating surface as well as circulation is attained in a small space to thereby especially adapt the boiler for use on steam yachts and other analogous small vessels; or for any other purpose where considerable horse power may be desired and yet condense the proportions of the boiler.

Having thus described the invention, what is claimed as new is- In a boiler of the character set forth the combination of opposite end water jackets with a lower tubular grate thereto and having outer ends extending upwardly, a steam dome mounted above the said water jackets and connected thereto,'and also to the said outer ends of the grate sections, tubes extending from one section to the other, inner up-flow coils attached to the water jackets 

